Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Suppression of polarization effects in Er-doped fiber source for gyroscope by polarization scrambling

자이로용 Er-첨가 광섬유 광원에서 편광 스크램블링을 이용한 편광효과의 억제

  • Published : 2003.08.01
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Abstract

In a broadband erbium-doped fiber source for fiber optic gyroscope, a pump-polarization scrambling scheme is used to suppress the polarization dependence of the source mean wavelength. The degree of polarization of the pump is reduced to 1.4% by applying proper modulation depth to the polarization modulator where 10 m-long single-mode fiber is wound on a cylindrical PZT. In the case of using the pump-polarization scrambler as well as the output depolarizer, the mean-wavelength variations due to the random change of polarization are measured to be less than our measurement limit of 5 ppm.

자이로스코프용 광대역폭 erbium 첨가 광섬유 광원에서 중심파장의 편광의존성을 억제하기 위하여 펌프광의 편광을 변조함으로써 스크램블링하는 방식을 사용하였다. 원통형 PZT에 광섬유를 감은 형태의 편광변조기에 적정진폭의 변조를 가함으로써 펌프광의 편광도(시간평균치)를 1.4%까지 낮출 수 있었다. 펌프 편광 스크램블러와 출력단 depolarizer를 함께 사용한 경우에 임의의 편광변화에 대한 광원의 중심파장 변화가 측정기의 측정한계(∼5 ppm) 이하로 관찰되었다.

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References

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